It is an invasion of microorganisms into the body that are capable of producing a disease.

It is an organism with the ability to cause disease. 

It provides a way for a microorganism to leave the reservoir.

It is the method by which the organism moves from one host to another.

It is an opening allowing the microorganism enters the host.

It is a person who cannot resists a microorganism invading its body.

It is the time when illness reaches its highest point of development.

This is the time when recovery seems complete although the disease is still communicable.

It is when there are non-specific signs and symptoms appearing.

It is when a person acquires the pathogen until the appearance of the first sign.